Piston ring and compressor

a piston ring and compressor technology, applied in the direction of machines/engines, mechanical equipment, positive displacement liquid engines, etc., can solve the problems of impaired sealing properties of the piston ring, and achieve the effect of reliable sealing

Active Publication Date: 2021-05-27
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]An object of the present invention is to provide a piston ring capable of more reliably sealing a gap between an outer circumferential portion of a piston and an inner wall surface of a cylinder, and a compressor provided with the piston ring.
[0010]According to the present invention, it is possible to provide a piston ring capable of more reliably sealing a gap between an outer circumferential portion of a piston and an inner wall surface of a cylinder, and a compressor provided with the piston ring.

Problems solved by technology

That is, the conventional piston rings may deform without being able to withstand the pressure of the gas flowing in from the compression chamber, thereby causing a problem that the sealing property of the piston ring is impaired.

Method used

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  • Piston ring and compressor
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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0018]

[0019]First, the configuration of a compressor 1 according to the first embodiment of the present invention will be described with reference to FIG. 1. FIG. 1 is a cross sectional view schematically showing the configuration of the vicinity of a piston 30 in the compressor 1. It is to be noted that FIG. 1 shows only some components of the compressor 1, and the compressor 1 can be provided with any other components not shown in FIG. 1.

[0020]The compressor 1 is a reciprocating compressor that pressurizes gas sucked into a cylinder 20 through a suction valve 50 by the piston 30 and discharges the pressurized gas through a discharge valve 60. As shown in FIG. 1, the compressor 1 is mainly provided with the cylinder 20, the piston 30, a piston rod 40, and a piston ring 10. Although not shown, the compressor 1 is further provided with a crankshaft, a connecting rod, and a crosshead.

[0021]The compressor 1 in the present embodiment is used in a hydrogen station, which is a facility th...

second embodiment

[0060]Next, a piston ring 10A according to the second embodiment of the present invention will be described with reference to FIG. 5. While the piston ring 10A according to the second embodiment has basically the configuration similar to that of the piston ring 10 according to the first embodiment and achieves the effects similar thereto, there is a difference in that the second ring portion 12 is divided into a plurality of ring elements. Hereinafter, only the difference from the piston ring 10 according to the first embodiment will be described.

[0061]FIG. 5 schematically shows the configuration of the piston ring 10A in plan view from the axial direction. As shown in FIG. 5, the second ring portion 12 includes a plurality of (two in the present embodiment) circumferentially divided second ring elements 71. Each of the second ring elements 71 is a component having an arc shape extending along the circumferential direction of the second ring portion 12, and has an arc length slightl...

third embodiment

[0066]Next, a piston ring 10B according to the third embodiment of the present invention will be described with reference to FIG. 6. While the piston ring 10B according to the third embodiment has basically the configuration similar to that of the piston ring 10A (FIG. 5) according to the second embodiment and achieves the effects similar thereto, there is a difference in that the first ring portion 11 is divided into a plurality of ring elements. Hereinafter, only the difference from the piston ring 10A according to the second embodiment will be described.

[0067]FIG. 6 schematically shows the configuration of the piston ring 10B in plan view from the axial direction. As shown in FIG. 6, the first ring portion 11 includes a plurality of (two in the present embodiment) circumferentially divided first ring elements 72. Each of the first ring elements 72 is a component having an arc shape extending along the circumferential direction of the first ring portion 11, and has an arc length s...

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Abstract

A piston ring includes a first ring portion which is fitted onto an outer circumferential portion of a piston and which is capable of sliding relative to an inner wall surface of a cylinder, and a second ring portion which is fitted onto the outer circumferential portion of the piston, arranged side-by-side with the first ring portion in the axial direction, and which is capable of sliding relative to the inner wall surface of the cylinder. The second ring portion is fitted onto the outer circumferential portion of the piston in such a way as to be positioned on a side opposite to a compression chamber inside the cylinder, relative to the first ring portion, and has a greater hardness than the first ring portion has.

Description

TECHNICAL FIELD[0001]The present invention relates to a piston ring and a compressor provided with the piston ring.BACKGROUND ART[0002]Conventionally, as disclosed in Patent Literatures 1 to 3, in a reciprocating compressor and the like, a piston ring is used for sealing a gap between an outer circumferential portion of a piston and an inner wall surface of a cylinder. By fitting the piston ring onto the outer circumferential portion of the piston, it is possible to prevent gas in a compression chamber of the cylinder from leaking through the gap between the outer circumferential portion of the piston and the inner wall surface of the cylinder.[0003]Patent Literatures 1 and 2 disclose a piston ring provided with one ring member that is substantially L-shaped viewed in cross section and the other ring member that is put into the one ring member. Furthermore, Patent Literature 3 discloses a piston ring formed of modified polytetrafluoroethylene.[0004]The piston rings disclosed in Pate...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B39/00F16J9/16
CPCF04B39/0022F16J9/20F16J9/16F16J9/28F16J9/08F04B39/042Y02E60/32F16J9/06F04B39/0284F05C2225/04
Inventor KANEI, NAOFUMIOTSUKA, TOMOHIROITO, HIROTAKANII, HIROAKI
Owner KOBE STEEL LTD
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